using System;
using System.Collections.Generic;
using System.Text;
using System.Web;



public static partial class CacheHelper
{
    /// <summary>
    /// Insert value into the cache using
    /// appropriate name/value pairs
    /// </summary>
    /// <typeparam name="T">Type of cached item</typeparam>
    /// <param name="o">Item to be cached</param>
    /// <param name="key">Name of item</param>
    public static void Add<T>(T o, string key, double time) where T : class
    {
        // NOTE: Apply expiration parameters as you see fit.
        // In this example, I want an absolute
        // timeout so changes will always be reflected
        // at that time. Hence, the NoSlidingExpiration.
        HttpContext.Current.Cache.Insert(
            key,
            o,
            null,
            DateTime.Now.AddMinutes(
                time),
            System.Web.Caching.Cache.NoSlidingExpiration);
    }
    public static void Add<T>(T o, string key) where T : class
    {
        Add(o, key, 3600);

    }
    /// <summary>
    /// Remove item from cache
    /// </summary>
    /// <param name="key">Name of cached item</param>
    public static void Clear(string key)
    {
        HttpContext.Current.Cache.Remove(key);
    }

    /// <summary>
    /// Check for item in cache
    /// </summary>
    /// <param name="key">Name of cached item</param>
    /// <returns></returns>
    public static bool Exists(string key)
    {
        return HttpContext.Current.Cache[key] != null;
    }

    /// <summary>
    /// Retrieve cached item
    /// </summary>
    /// <typeparam name="T">Type of cached item</typeparam>
    /// <param name="key">Name of cached item</param>
    /// <returns>Cached item as type</returns>
    public static T Get<T>(string key) where T : class
    {
        try
        {
            return (T)HttpContext.Current.Cache[key];
        }
        catch
        {
            return null;
        }
    }
}

